/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings;
import android.app.Activity;
import android.app.PendingIntent;
import android.app.admin.DevicePolicyManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.security.KeyStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import com.android.internal.widget.LockPatternUtils;
public class ChooseLockGeneric extends PreferenceActivity {
@Override
public Intent getIntent() {
Intent modIntent = new Intent(super.getIntent());
modIntent.putExtra(EXTRA_SHOW_FRAGMENT, ChooseLockGenericFragment.class.getName());
modIntent.putExtra(EXTRA_NO_HEADERS, true);
return modIntent;
}
public static class ChooseLockGenericFragment extends SettingsPreferenceFragment {
private static final int MIN_PASSWORD_LENGTH = 4;
private static final String KEY_UNLOCK_BACKUP_INFO = "unlock_backup_info";
private static final String KEY_UNLOCK_SET_OFF = "unlock_set_off";
private static final String KEY_UNLOCK_SET_NONE = "unlock_set_none";
private static final String KEY_UNLOCK_SET_BIOMETRIC_WEAK = "unlock_set_biometric_weak";
private static final String KEY_UNLOCK_SET_PIN = "unlock_set_pin";
private static final String KEY_UNLOCK_SET_PASSWORD = "unlock_set_password";
private static final String KEY_UNLOCK_SET_PATTERN = "unlock_set_pattern";
private static final int CONFIRM_EXISTING_REQUEST = 100;
private static final int FALLBACK_REQUEST = 101;
private static final String PASSWORD_CONFIRMED = "password_confirmed";
private static final String CONFIRM_CREDENTIALS = "confirm_credentials";
public static final String MINIMUM_QUALITY_KEY = "minimum_quality";
private static final boolean ALWAY_SHOW_TUTORIAL = true;
private ChooseLockSettingsHelper mChooseLockSettingsHelper;
private DevicePolicyManager mDPM;
private KeyStore mKeyStore;
private boolean mPasswordConfirmed = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
mKeyStore = KeyStore.getInstance();
mChooseLockSettingsHelper = new ChooseLockSettingsHelper(this.getActivity());
// Defaults to needing to confirm credentials
final boolean confirmCredentials = getActivity().getIntent()
.getBooleanExtra(CONFIRM_CREDENTIALS, true);
mPasswordConfirmed = !confirmCredentials;
if (savedInstanceState != null) {
mPasswordConfirmed = savedInstanceState.getBoolean(PASSWORD_CONFIRMED);
}
if (!mPasswordConfirmed) {
ChooseLockSettingsHelper helper =
new ChooseLockSettingsHelper(this.getActivity(), this);
if (!helper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST, null, null)) {
mPasswordConfirmed = true; // no password set, so no need to confirm
updatePreferencesOrFinish();
}
} else {
updatePreferencesOrFinish();
}
}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
Preference preference) {
final String key = preference.getKey();
boolean handled = true;
if (KEY_UNLOCK_SET_OFF.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, true);
} else if (KEY_UNLOCK_SET_NONE.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, false);
} else if (KEY_UNLOCK_SET_BIOMETRIC_WEAK.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK, false);
}else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_SOMETHING, false);
} else if (KEY_UNLOCK_SET_PIN.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_NUMERIC, false);
} else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
updateUnlockMethodAndFinish(
DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC, false);
} else {
handled = false;
}
return handled;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = super.onCreateView(inflater, container, savedInstanceState);
final boolean onlyShowFallback = getActivity().getIntent()
.getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
if (onlyShowFallback) {
View header = v.inflate(getActivity(),
R.layout.weak_biometric_fallback_header, null);
((ListView) v.findViewById(android.R.id.list)).addHeaderView(header, null, false);
}
return v;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CONFIRM_EXISTING_REQUEST && resultCode == Activity.RESULT_OK) {
mPasswordConfirmed = true;
updatePreferencesOrFinish();
} else if(requestCode == FALLBACK_REQUEST) {
mChooseLockSettingsHelper.utils().deleteTempGallery();
getActivity().setResult(resultCode);
finish();
} else {
getActivity().setResult(Activity.RESULT_CANCELED);
finish();
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Saved so we don't force user to re-enter their password if configuration changes
outState.putBoolean(PASSWORD_CONFIRMED, mPasswordConfirmed);
}
private void updatePreferencesOrFinish() {
Intent intent = getActivity().getIntent();
int quality = intent.getIntExtra(LockPatternUtils.PASSWORD_TYPE_KEY, -1);
if (quality == -1) {
// If caller didn't specify password quality, show UI and allow the user to choose.
quality = intent.getIntExtra(MINIMUM_QUALITY_KEY, -1);
quality = upgradeQuality(quality);
final PreferenceScreen prefScreen = getPreferenceScreen();
if (prefScreen != null) {
prefScreen.removeAll();
}
addPreferencesFromResource(R.xml.security_settings_picker);
disableUnusablePreferences(quality);
} else {
updateUnlockMethodAndFinish(quality, false);
}
}
private int upgradeQuality(int quality) {
quality = upgradeQualityForDPM(quality);
quality = upgradeQualityForEncryption(quality);
quality = upgradeQualityForKeyStore(quality);
return quality;
}
private int upgradeQualityForDPM(int quality) {
// Compare min allowed password quality
int minQuality = mDPM.getPasswordQuality(null);
if (quality < minQuality) {
quality = minQuality;
}
return quality;
}
/**
* Mix in "encryption minimums" to any given quality value. This prevents users
* from downgrading the pattern/pin/password to a level below the minimums.
*
* ASSUMPTION: Setting quality is sufficient (e.g. minimum lengths will be set
* appropriately.)
*/
private int upgradeQualityForEncryption(int quality) {
int encryptionStatus = mDPM.getStorageEncryptionStatus();
boolean encrypted = (encryptionStatus == DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE)
|| (encryptionStatus == DevicePolicyManager.ENCRYPTION_STATUS_ACTIVATING);
if (encrypted) {
if (quality < CryptKeeperSettings.MIN_PASSWORD_QUALITY) {
quality = CryptKeeperSettings.MIN_PASSWORD_QUALITY;
}
}
return quality;
}
private int upgradeQualityForKeyStore(int quality) {
if (!mKeyStore.isEmpty()) {
if (quality < CredentialStorage.MIN_PASSWORD_QUALITY) {
quality = CredentialStorage.MIN_PASSWORD_QUALITY;
}
}
return quality;
}
/***
* Disables preferences that are less secure than required quality.
*
* @param quality the requested quality.
*/
private void disableUnusablePreferences(final int quality) {
final PreferenceScreen entries = getPreferenceScreen();
final boolean onlyShowFallback = getActivity().getIntent()
.getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
final boolean weakBiometricAvailable =
mChooseLockSettingsHelper.utils().isBiometricWeakInstalled();
for (int i = entries.getPreferenceCount() - 1; i >= 0; --i) {
Preference pref = entries.getPreference(i);
if (pref instanceof PreferenceScreen) {
final String key = ((PreferenceScreen) pref).getKey();
boolean enabled = true;
boolean visible = true;
if (KEY_UNLOCK_SET_OFF.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
} else if (KEY_UNLOCK_SET_NONE.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
} else if (KEY_UNLOCK_SET_BIOMETRIC_WEAK.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK;
visible = weakBiometricAvailable; // If not available, then don't show it.
} else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
} else if (KEY_UNLOCK_SET_PIN.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
} else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
}
if (!visible || (onlyShowFallback && !allowedForFallback(key))) {
entries.removePreference(pref);
} else if (!enabled) {
pref.setSummary(R.string.unlock_set_unlock_disabled_summary);
pref.setEnabled(false);
}
}
}
}
/**
* Check whether the key is allowed for fallback (e.g. bio sensor). Returns true if it's
* supported as a backup.
*
* @param key
* @return true if allowed
*/
private boolean allowedForFallback(String key) {
return KEY_UNLOCK_BACKUP_INFO.equals(key) ||
KEY_UNLOCK_SET_PATTERN.equals(key) || KEY_UNLOCK_SET_PIN.equals(key);
}
private Intent getBiometricSensorIntent() {
Intent fallBackIntent = new Intent().setClass(getActivity(), ChooseLockGeneric.class);
fallBackIntent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, true);
fallBackIntent.putExtra(CONFIRM_CREDENTIALS, false);
fallBackIntent.putExtra(EXTRA_SHOW_FRAGMENT_TITLE,
R.string.backup_lock_settings_picker_title);
boolean showTutorial = ALWAY_SHOW_TUTORIAL ||
!mChooseLockSettingsHelper.utils().isBiometricWeakEverChosen();
Intent intent = new Intent();
intent.setClassName("com.android.facelock", "com.android.facelock.SetupIntro");
intent.putExtra("showTutorial", showTutorial);
PendingIntent pending = PendingIntent.getActivity(getActivity(), 0, fallBackIntent, 0);
intent.putExtra("PendingIntent", pending);
return intent;
}
/**
* Invokes an activity to change the user's pattern, password or PIN based on given quality
* and minimum quality specified by DevicePolicyManager. If quality is
* {@link DevicePolicyManager#PASSWORD_QUALITY_UNSPECIFIED}, password is cleared.
*
* @param quality the desired quality. Ignored if DevicePolicyManager requires more security
* @param disabled whether or not to show LockScreen at all. Only meaningful when quality is
* {@link DevicePolicyManager#PASSWORD_QUALITY_UNSPECIFIED}
*/
void updateUnlockMethodAndFinish(int quality, boolean disabled) {
// Sanity check. We should never get here without confirming user's existing password.
if (!mPasswordConfirmed) {
throw new IllegalStateException("Tried to update password without confirming it");
}
final boolean isFallback = getActivity().getIntent()
.getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
quality = upgradeQuality(quality);
if (quality >= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC) {
int minLength = mDPM.getPasswordMinimumLength(null);
if (minLength < MIN_PASSWORD_LENGTH) {
minLength = MIN_PASSWORD_LENGTH;
}
final int maxLength = mDPM.getPasswordMaximumLength(quality);
Intent intent = new Intent().setClass(getActivity(), ChooseLockPassword.class);
intent.putExtra(LockPatternUtils.PASSWORD_TYPE_KEY, quality);
intent.putExtra(ChooseLockPassword.PASSWORD_MIN_KEY, minLength);
intent.putExtra(ChooseLockPassword.PASSWORD_MAX_KEY, maxLength);
intent.putExtra(CONFIRM_CREDENTIALS, false);
intent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
isFallback);
if(isFallback) {
startActivityForResult(intent, FALLBACK_REQUEST);
return;
} else {
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);
}
} else if (quality == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) {
boolean showTutorial = !mChooseLockSettingsHelper.utils().isPatternEverChosen();
Intent intent = new Intent();
intent.setClass(getActivity(), showTutorial
? ChooseLockPatternTutorial.class
: ChooseLockPattern.class);
intent.putExtra("key_lock_method", "pattern");
intent.putExtra(CONFIRM_CREDENTIALS, false);
intent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
isFallback);
if(isFallback) {
startActivityForResult(intent, FALLBACK_REQUEST);
return;
} else {
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);
}
} else if (quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK) {
Intent intent = getBiometricSensorIntent();
startActivity(intent);
} else if (quality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
mChooseLockSettingsHelper.utils().clearLock(false);
mChooseLockSettingsHelper.utils().setLockScreenDisabled(disabled);
getActivity().setResult(Activity.RESULT_OK);
}
finish();
}
}
}